The state-of-the-art technology of qubit manipulation enables us to exploit quantum resource, such as entanglement or coherence, for technological purposes [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}.
A recent development of this direction is studying “quantum batteries”, which harness the unique property of quantum thermodynamics to speed up the charging process and extract more work compared to their classical counterparts.
The ideal of quantum batteries was first put forward by Alicki and Fannes in 2013 [8]}.
They demonstrated that entangling unitary controls (i.e., collective controls) perform better than individual controls (i.e., parallel controls) in work extraction.
Further research uncovered that entanglement generation benefits the speedup of work extraction [9]}.
Subsequently, the authors of Refs. [10]}, [11]} argued that, in the charging process, the collective charging scheme results in \(k\)  time faster than the parallel charging scheme, where \(k\)  denotes a \(k\) -body interaction among battery cells.
Therefore, we now say quantum batteries have quantum advantage.
